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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc7b1e2d32aaf9df44fc26d21cd25237eb989bf6cc77a554419972d04fd5f0f' 
  AND token = '2A6j19gVCkqCPyCKEmiUonNNOMLC7bs2L0MpPe8/B9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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