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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10afbfec72b72ebcf5c7fb61413ab617b8e454d40382cbf63c194552c432aad3' 
  AND token = 'UNOOJJsBtbFCQs9dBJBW0/dI/h+z485LnsbPrD2S9Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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