Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6c0ce95456821f5a61faa83f7666b01493dbbb870906a23b4542e4e174e8ccd' 
  AND token = 'cqKkYNcOnu6MgfWc/YJ7HCE7qz9vD5XYC5bsE1aiVdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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