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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa80360b5f93089ef7a3625afcce42832b1b943274316f132ac6eb69ec7c92c8' 
  AND token = '6o2pMJ64SL9A1rmcBre1MdEKXdN2o6BhCB+nV7as32M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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