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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ac5b022e652d3f523e3318594a6d2e208ae38af6ad8faa66290cdde3b815214' 
  AND token = 'U7ZX/8Rq8WxnD+RFjn7X1M9Xk1fkBMrNI1/jX4rhnXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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