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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3277a6cfeba471448a27afdb571430c14e1796833d0ee1ce078a56a9736ddb0' 
  AND token = '34yuv0pyahbt6tngDTEXTI02DUUVHBIirZJSEmW1QUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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