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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82c3f2ffe83446b27e6b588f520fd860a2391f0ef70c186e8a6e9c72f614fd9' 
  AND token = '5Gri3GgxsIapS7PV2gaOd2F6H6CGp4RIshwx6qPkZWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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