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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57692928eb6297799efa2fe6238756e5c1996e383638178d2b9199b7ebef9662' 
  AND token = 'kX4zaLtxCU2AhzK1TcKTuCfI+tkilghe6smUc3LR69E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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