SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b44795d7d286273c29d0ea4b36870c34b61175f9f5b9af731eea39925f97323' 
  AND token = 'bjrpusGj2BeMvB6RFKGHQ47w9oG+FHeHSwMR+Nqz1sI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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