SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695078100040fe71d327739810c2fa490b3e3d4eca7bb3ee61b8682f489ff859' 
  AND token = 'JhvNER2ZX7/EYocpydCBYUrdvqzwGXbs8BC++ArzQOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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