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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013eaf5121671d00cf41e3411e49cb02eceab7c5cfd4ca4b31f52730ef0f44d7' 
  AND token = '9vsufYLLs+VAtQMdUm9j7GUxP53sODV/k6RnKgLVfjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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