Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d79bbdb1685a6d2eab47919a7257a26ee880faba1d4bfd7b2018df8c2706a4b' 
  AND token = 'AwDIwVEBzMAm/feSS3MDzfAp5AxNiurWr8crgvboeZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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