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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878f47728655e94950e00c039bb3f458ab7969d1cd24ce51c9ae1eb8e0eb1f95' 
  AND token = 'f1w8AK9Ga4BWl4xOIe1XxkNublYzPAi3znnjg88BeBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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