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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60c28bca99065865c54791b68c239ab933a0806ae5395d5b41ac01e916c76508' 
  AND token = 'aA0oo1hhHc/SE6s212YkotZjNKP0w5JVojWlfgpgu+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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