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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2797b17afd1f9776cd105009770e2a1edba66d7512b84c97a28e76f6ba01686' 
  AND token = 'U0B8/+WygTKrSlokeIXkcBX3XOfUOCsHTZNzcDJcMYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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