Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba918841c1de1bcf4968bf415a3acdc435f3cbc553681b50d490a68a639ac4a' 
  AND token = 'lTlOT692oy+UajmwcJqePK4ADRiwEsld7G7SahMGL/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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