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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f613f75546ad29c96a21cbb528bda021521587e740b0a6560ab6065a4ee472' 
  AND token = '57d5tZMluxK4SPbr/oNYY3T1ogU7oGxL90qf5Dbf5fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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