Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c7b1be78a3ad5b3b28848983b85d54b8da6efef8fdc9fa43a878281e5c5ed0' 
  AND token = 'fYljvCtwxm9ki9nJUw4QWRlPoRVNtGj2fCZzxDGNprQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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