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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ef7ea4d40dcadc57b8d8b03efdb68606108daf45ed588e9550314bda29db3a' 
  AND token = 'RqSNnVHqAXKAviebu9c8HYNLKrk+3L8T0F8OoljPc34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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