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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b911eb1ec846f695da288b60dced6f44249837046c091fc9ef8e5aa16e41c25' 
  AND token = 'Z34L1qpw3o1NY9gPLN0dOWVrkbAHFBLGRYZwVPaaunI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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