Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5833f3eebe321ed1dbbd8ef2850abfe7cd13a6ea59b2feeef97cfd637e3378dd' 
  AND token = 'Thr0AEriOuEbmOAp8IUpGm/M0YvayUKALez0SuBPiZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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