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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef81b7cd2d79f8394cefc19982194a69ff18193a018f40a6a321695331aef338' 
  AND token = 'HJ/BFfl3mhh7aXWZ1r7DNgX8Xy9/uwQo4SNfKRxWd8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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