SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535e530b5f839e37a9c857d17b30f65a37bf4eed0ae07ac21a6652e1ff6ec881' 
  AND token = 'ja4XOwv3CIz+CnUVtgKI/4Cx2IYb5sNGmlVQlVRnZCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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