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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '633e9256008e1f7ccc6f5619f6b32398b04e59d819869815bc9b80b7b8f8d9c2' 
  AND token = 'oLqlIX6OiAdSlTD9dj3OcDPEAUU56O6QamUl7SIXw/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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