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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ebd8383ea53d7d48b0265303e467d8cfe680d789873cd3c1fe85c4ce60b4ac' 
  AND token = 'ty/sOeYql2n3zMX1i5U7cUWxuKobi6TcR1J1CBYhJoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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