Why is my MySQL query so slow?

Background:
entities tables currently开发者_运维知识库 has 14,111 records
articles table currently has 5211 records

I am trying to find all articles that are active (completed) and have the entity 'google'

# Finding articles that have the entity google takes:
# 4 ms
SELECT `Article`.`id` FROM `articles_entities` AS `ArticlesEntity`
LEFT JOIN `entities` AS `Entity` ON (`ArticlesEntity`.`entity_id` = `Entity`.`id`)
WHERE `Entity`.`strict` = 'google'

# Finding articles that have the entity google and is active takes:
# 1800 ms
SELECT `Article`.`id` FROM `articles_entities` AS `ArticlesEntity` 
LEFT JOIN `entities` AS `Entity` ON (`ArticlesEntity`.`entity_id` = `Entity`.`id`)
LEFT JOIN `articles` AS `Article` ON (`ArticlesEntity`.`article_id` = `Article`.`id`)
WHERE `Entity`.`strict` = 'google' AND `Article`.`state` = 'completed'

What might be the issue with the query taking so long?

I would add that both fields in the pivot table are indexed.

Thanks in advance for you help

UPDATE

id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE Entity ref PRIMARY,strict strict 767 const 1 Using where
1 SIMPLE ArticlesEntity ref article_id,entity_id,article_id_2 entity_id 108 b2b.Entity.id 4  
1 SIMPLE Article eq_ref PRIMARY,state PRIMARY 108 b2b.ArticlesEntity.article_id 1 Using where

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Entity.strict or Article.state are not indexed. Use EXPLAIN before your SELECT statement and check which tables are being fully scanned. That will hint what needs indexing.

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do you really need the left join?! imho your query should get a boost without it ;)