SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd221d1f1500a6d8087d3fa61c9a58c7f735b7feb3fd5b18920c499842045b5ff' 
  AND token = 'ZvPPVdgv26D9uihFfo6Almf9y7YWeX0Vh8eJgGqL+UI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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