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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c6f0be0e9ed5eb0c040a415b27eb794a05bcff147b9ef4cbfbd5da3cf281e4' 
  AND token = 'Rb6ys8KrpcVt/MOzp7ycykIecoOt8UCrSzV6evgUG78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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