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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b56dfcd3a33557ed1d13928d3c1ca5a8ba03c67941c6cc7941ec912167f1fa1' 
  AND token = 'VzSvDc263AzWsPMQd19oUkxRz5kJfL23sM/XSOzSWNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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