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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1594a76e41b3c4fc8930932b17e579940a6775d50b4744b65515321a9a283c5' 
  AND token = 'z4MzO2NzsmY96lP8J5fJxux8YM6DL0eaiWLyDOeYKVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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