SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1235cc9e9e02a2ae8706c284c32653eef895cfd0b94cc6e600ed965a7e575eee' 
  AND token = 'V6CxgIjqvXeuKC0ODlJD8IgbdUCYv5ofEWZEZniasrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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