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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28242acfd2d4876ca90436b628bace67d869af974a9d6551869563a8bb23a464' 
  AND token = '6AiMNL2ISH5L3vOwmy1Na7kPHA5TztSvw7zNVbHyAC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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