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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82eaf6e69441d7a41d18d3c5b1a8368646c70ed29895cbe94689ded553633943' 
  AND token = 'TqLjPM4zU6ISpR/eh7Y56/qdqT9GWGEiHmhW5JK7qew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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