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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9dc78913d6887fe95629d76fe8fec2ad18b37397983dfb58ef9ed4dfe832f70' 
  AND token = 'H6UrUlJj10UWUuOortkXhlhqBasTKvwhDyNIz45sJp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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