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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4cce4406a8264d6f194b9d512771594daf65118abe93a336c849cdde1f55eb3' 
  AND token = 'p6gGN6HYGYveRVtKtXybWHUsZSrl/t396E23W90JkmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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