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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d9350c3c22a74cd92cd163189d97f0fe78a3709db476f2f8e962714db4a814' 
  AND token = 'g6KBkEJNci+E3wN6Iq+83qBObOUoO8uTuMv3Jigyk9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}