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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23706143b9b3360c383cc3d3676a5a903f99a3cdcd8c753dfad140d18187735' 
  AND token = '68aT3dnHktKn/E4560D+O+G8mnnjev3MYjoOnGw5gSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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