SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164b84b17499691fa75acbd7f9254a6b05ab349360fd16bc6d9c4f9718be9775' 
  AND token = 'jmrNQ5vBsLjVJ+SqwR3pvoEO/WllxCsz7Dj0wkmwLsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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