Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c0e5134e3efcc02914ec78d62b87fffc29dfd67434c7977971ffcce8a05a418' 
  AND token = 'LbNiTo1ZbT00o3eRaaR9X9vAOz3RMBbEhAwtZI53pWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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