SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7d86c8bb5f9b5d3f1b1927a7cf0d84af86a41e4cb37f44df99342b0e16e4be3' 
  AND token = '9ueECZ7uUiYVCqstY6g7AnDCTBj+p/njeajXqtF1VpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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