SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45d98d697c5b1316c47a58485dd4f224146320ba633e2d9651e7bc6a8a2b1f1' 
  AND token = '1lGEVBQh3InpIWbHGLM29svTjF6RHfGDIIMZwLovitA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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