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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6047a69908994651d5175f5f046431bbd6eadedc4e4f6d4cf17c998a41d674d' 
  AND token = 'lBrz4DQUta41OsbJqgFUeJd9ABaLpzbs3wVpPx6g1/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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