SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d540e9c583a8d21b290649fd2e91ca8f303737c3f509e7fdebb3b79fdc4501' 
  AND token = 'nQXb+ye/K0sywgJXlnyRVSxpEjRX4rTBdj2zXLqBmM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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