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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a8bfb2438979a425dd46e90f1a5fd1e1d04d506cff3d6a0bab7ba9f193c12f' 
  AND token = '/8N4tFBK55iCuNMKpMo9pTTOHZ/rUPtT7yg5hpkUQXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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