Optimize the query

I have following query for find out the total no of counts.

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  SELECT count(*)
  FROM contacts_lists 
  JOIN plain_contacts
    ON contacts_lists.contact_id = plain_contacts.contact_id
  JOIN contacts
    ON contacts.id = plain_contacts.contact_id
  WHERE plain_contacts.has_email
    AND NOT contacts.email_bad
    AND NOT contacts.email_unsub
    AND contacts_lists.list_id = 45897

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It takes 150ms to complete its task. Is there any another way to ru开发者_如何学Cn the above query? Is there any way to reduce the time? is it possible? please tell me.....................................

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Did you create indices (add_index in migrations) on your contact_id columns? Also it might be better to use

JOIN contacts ON contacts.id = contacts_lists.contact_id
# instead of: JOIN contacts ON contacts.id = plain_contacts.contact_id