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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1238a335221bd883cb730ba33b1c21280e68a7bef3f24793a5a4d93ff3df7e4' 
  AND token = 'WPyg56iMtLrn5810tDX++4WWB+bnEtcOtC6UH1BBKac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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