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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b680a9f7e5d06411b5303ac59fc67361048d4108be72edbfa727fce0c10ee17' 
  AND token = 'D64PnPwsFL22Ayl+PuVKJ83lTBtq9D15eZFXdE2Mwv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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