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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76051790cd475d48a15cc8ecaaa7bdb31045cc453917897afc0462234c62fcf3' 
  AND token = 'sESpudAzfacXgTW+5HXq7yw8CjSqM0Q1T5OQk13s78M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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