QUERY PLAN
Limit (cost=51.18..51.18 rows=1 width=149)
-> Sort (cost=51.18..51.18 rows=1 width=149)
Sort Key: s.created_at DESC
-> Group (cost=51.16..51.17 rows=1 width=149)
Group Key: s.id, u.id
-> Sort (cost=51.16..51.16 rows=1 width=149)
Sort Key: s.id, u.id
-> Nested Loop Left Join (cost=0.00..51.15 rows=1 width=149)
Join Filter: (u.id = s.head_of)
-> Seq Scan on tbl_tasks s (cost=0.00..43.37 rows=1 width=145)
Filter: ((head_of = 5250) AND (status = 0))
-> Seq Scan on tbl_users u (cost=0.00..7.76 rows=1 width=4)
Filter: (id = 5250)