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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabd4cd63f42b83138d01364e3d8685593ca1deb89e97e22f3d356cc41d36b66' 
  AND token = 'GatZ81eDdL7j+kpNnjjVOxWilLDiYRqD67vucixHX18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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