Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289bcbea025f8a02cbe0f06eb6e40676d826bf4eb394999cae09f818a69e6876' 
  AND token = '8O7SyFjEAfqLBoZF+7e7oDp2Is9V9CdaiJ+gWOsk8Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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