SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d92a4217d04bc9f9e06c227537efb84ee3fa40c81af598933d5db124b6ba6ec' 
  AND token = '92YYW+NkW+D5FPopjE0LZIgmhf+UvrMA83vDvjoG2Lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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