Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb8f9778923f015ed1684ed4b6846e69df7f7025d6106bbeb7cd46cc22d1c6df' 
  AND token = 'nT4a0RTX8iPtU/0cp6DUWkLzOFpMrqYkcGvx8Ua6ffw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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