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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d9948b2ff4de57da91ffb8c6786abb18bbbd2444a6991b66bef5e03719fc59a' 
  AND token = 'ItW6rPPS/kq17nQhCPqUe5W0I5HUnbF0DiL7JukNMQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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