SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3214eac019e90998a67ed8cfba741b88c4d23921b0436397056d9e5b0235b53e' 
  AND token = 'ZwkmKOL+YK1k6HElwE+leacWFUgxpcVY6uVDWYvarzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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