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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd746760e39940c816ab24f8fc7e4a167b83e89981e684a67c71a50a5b2537146' 
  AND token = 'NtBMc8N+KkleSNL1NcSC9mS6ENToPY0po+1HTLjf+V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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