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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a49f9901695d44f471c4bc49014e83340daaea0bb2504cf11b5b69013caf43' 
  AND token = 'yDtO5mmQTyGt34fPwjA+u6DsWGZk8JCxe3IRuNna6U4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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