SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1941fe2e72ec2d12de3c6f3e6c9cc5299616778f1987579dbb3fc5ec7880a056' 
  AND token = 'WFh4uomjn2yqPUQSwogCebsli8ZHwXvYtMncLcJl5uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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