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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ee8fc03c5235549aee8739ed4aef429c5aba2a12afd221d7d78d69b9ba8177' 
  AND token = 'TRqL96OW5QWr9bG/WBpvqKBS+jHXKb+HSWNKpaRULMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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