SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ffbd5c6e747a8ac5fd18f681d499ba4bb63cfa2ea2857a925ea06b4ecc59096' 
  AND token = '1Blz0dJHxx4BKjdPCWhpszPYQ20w76L3CIQAngBrTWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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