Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c423eeffb6176b91ec43b52c7102bc0b6c635677439036c7d6de9b6bcad755f' 
  AND token = '0oJDQbs01Yek93fpDKc631AGWEmUsiJquUZIgfI4bnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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