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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '079f7de4eaec43eed956ace67e9b126a85313f649dca0a83c7d8d5a181df8a2f' 
  AND token = '/wJFOyFDKZ+jrUaSroCNZBcTQOUVduyESwDolB91Bfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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