SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '956f27e6b7f256b71b62a19d287ecb262764bc86a1381fefc0a4ae11f894a9c2' 
  AND token = 'maXJaS+fZvV/zdOqBhjdwuGU1zKKZuw5EWd7NQpdGC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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