jrFollow datastore
Using Jamroom
The 'follower' profile (and user) IDs are '_profile_id' (and '_user_id').
And just to clarify 'follow_active', that is set to 1 when the follow is instigated and the datastore entry is created. If the follower then un-follows it is set to 0 but the entry remains on the datastore so yes, its correct that you check for this in your search.
Hope that helps