SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd95532693269f032f2fb43a41f094c5ac798e25c717394a28c8d3cf92955984e' 
  AND token = 'w7PDJXlgA+ftlAhIZjLrF6+dHusBemUlI9WCywzyXFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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