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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b02f1bab9a0b8c8a860e7e802e0e67eee21293a03ff791632c6fb9865e39698' 
  AND token = 'ZuSmT+Y2vt+RekuOak3/9jTyjr6Zit2jNYTW6oXY2eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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