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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '131497b0cee9cced735051c222a98f35a6c9f2efe1cb1aafd4f7a33d822a8ee1' 
  AND token = 'G7jUJjTawR0UMxH9WsEhNkf/NmIGaZOnRTUSEk+asBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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