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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c7fab4b5374ac545d33a6a2251b045e1474d89c50fbc27172715a318dd84cb' 
  AND token = 'OqEViMf6ZR+cVzrJ81OhDjw1rXanafWj4b5nWahYpxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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