Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec952d6bea2075a136701e4ab1dcc9b3a10580c09b51100e2ca2fd948c53621a' 
  AND token = 'TTjjvkWhgg5F87dfmham2JztgvDfOwiaCbdeT/BQcQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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