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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97dd24adb3f2d41d840e7e5ea088a339b9c9ec08f77a35e8660a98ffb306250c' 
  AND token = 'gg4Me740v1JJ6+6eh7OAYJ3QpKU0IxdM3QXUhWZBcIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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