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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21a342a3722e145536dcc43c7254ad24bcae21225fb3872c4a89af04207b3d7' 
  AND token = 'QEGfwjUNVOzYXINbOuxUQTiELKCR1ZvOh61RpQnBlnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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