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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '842d99a7971586cbad5f6b729c8870f0794f2523727cf781e73e581e209512c4' 
  AND token = '4oD/AAmjDj+hVQyVP7Rt9ViLUaJIZ8U1Hi77RL399GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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