SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6372e3c37990d793914dcb5d3df974d3f851702222d11f2ac7dc93a90c8b2770' 
  AND token = 'w8ppOUmb0kCzqZ4upWvuL/6k/+/ljFT8ltRoPhtHblg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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